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When the Master staggered out of a rip in spacetime and into the control room of the Doctor's TARDIS, it felt like the most natural thing in the universe to kiss him.
He found himself on his back, his jaw throbbing. The Master stood over him, fists clenched. "If you ever do that to me again -- "
"It was just a kiss," the Doctor said. He smiled, to cover his confusion. "You used to like kissing."
The Master bared his teeth. "If you ever touch me again, Doctor, I will snap your neck, and take my chances with your next regeneration."